The fee is likely to increase with performance-related add-ons and a substantial sell-on clause.

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Lindsay is believed to have travelled south for talks but, with other clubs interested, is under no pressure to make his mind up quickly.

Thistle had hoped to hold on to their star man but have reluctantly come to the conclusion that they cannot stand in his way, given the terms on offer for the Jags and the player from the big-spending League One outfit.

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